Function after

after is a more readable version of setTimeout, implemented as an await-able Observable. after is lazy, and cancelable like an Observable, and then-able and await-able like a Promise.

after is single-valued if a primitive or thunk is its 2nd argument, multivalued if an Observable. For a delay of 0, the value is given synchronously when .subscribe() is called.

Returns

An await-able Observable of the object, thunk return value, or Observable's notification(s).

Argument

delayArg Either a number of milliseconds, a Promise, setTimeout, or requestAnimationFrame

Argument

valueProvider Can be a value, a function returning a value, or an Observable.

Argument

observer A TapObserver that can handle subscription or value events.

See

https://www.youtube.com/watch?v=Bvsb9Qy1V9g for how after can be thought of as a 2-dimensional value, a composable vector in the 2-D space of time and values.

Example

after(0, value)            # sync value
after(N, value)            # delayed value
after(N, ()=>value))       # delayed call
after(N, Observable))      # delayed Obs.
after(Promise, ()=>value)) # chained Promise
after(N, value, {next})    # with Observer
after(setTimeout, v)       # setTimeout(0)
after(rAF, v)              # ani. frame